Radiator Hose Springs - Yes or No ?

Just dealt with this a couple of weeks ago. A friend replaced his radiator hoses on his six cylinder pickup early this spring because the top one got a tiny leak. He recently reported to me that the pickup would occasionally overheat since that change. I asked if he took the spring from the old lower hose and he told me the guy at NAPA told him he would not need a spring. We went to my shed and got a spring from a sprinkler head and stretched it to length. Dropped the lower hose, inserted the spring and hooked the hose back up to the radiator. His truck has not heated since the spring replacement.